I'm trying to sort out what's going on in the Halls of Fabrication.
What I gather is that the Halls are Sotha Sil's production factory, they are in clockwork city, but have an extension/portal into Vvardenfell, beneath Tel Fyr.
What I DON'T understand is...
1) Why is it dangerous / aggressive / malfunctioning?
2) Who are all the dead / wounded people in the lobby of the trial?
I guess Fyr went in once to investigate, and discovered that someone else was also there mucking around - and maybe this is what set the halls off balance? Then he returned. The dead and inured people are members of his "trial team" (party). So we are the 2nd expedition.
If this is true it would really make no sense to destroy the Assembly General, rather we should find out who is tampering with it and destroy THEM.